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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15e2058b12783bcaee58a8c3fa587278e1c9246a3ca8b7bcf6d8c2c312ea6ac4' 
  AND token = 'vOuqY9m3ij7PYR/AvJ6NgC55df4udIEEAl+N/1xJ2pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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