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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdea44d6ad661cd9a44cc49c2cb2fab5412070744c1353697f052add5f11f6e2' 
  AND token = 'nnqE29Dvyrwt9zDhbaxUFn8wCPxJZliOG0ZPQj9xPs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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