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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b32b5d58e556b1d841084a4aa030b9fb8068d946b785d311ab4853089555fb' 
  AND token = 'adEamNMRqphI1+8Rar6cg0y2jg65wbbucK2U3IgKzio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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