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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23567bcc3182b7f7bcb3f53f2cc75f3a94e1d0d785ae00b3e3da6b629c568cf5' 
  AND token = 'EIZlj6ZkkQTspesEPjpn52j4XIiMfE4LTW7yi3N8onQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}