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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba27f8717a02460c800b0630b35383481e567efdd6d2b9977428b1651b40e33' 
  AND token = 'VQUmJxCLWPQB66yu15XyOh2qyFNF04x89WKYAcjsrmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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