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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b2984b7b54db52b08572ecc7e3ea8cc00c39e1ecb0394aa7da7ec65354367c7' 
  AND token = '2S3lOq9AC/CprX/jNTIOAwWe94eUggiYtttxxmuSK4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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