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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa079e8b527b12d7f6669cce661c271cb9e2878ddd9efe89bcb582ac220ae21d' 
  AND token = 'qzxjWD26llZUHv6oHqq+H0Lp/IXgC6gLFoNaXpVyN2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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