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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c1dc2bfdf78d437cba745c6c6f88cdc3cdd32754e3d236c33724693c30d65ee' 
  AND token = 'sCjfvdfiNR71Oez2/U24hvXN3mXM8+hLb01i+81iGow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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