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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2c4026d4eb50fc7ad94c08847e49dc41fba985f028a0bb3eadd530da1d6d5f4' 
  AND token = '347b/NrX1tV7kJMwZ9idrQC2t8tBVggnVC3UrNr5VuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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