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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11a30f2ee641fc02e45ad68c9a62f4db6f8064daaa5d8d3044e270df28acc3b' 
  AND token = '+IMcKdjzPW8uSsZaIv7af3e2C8l/jz62wPYbtWwrpw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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