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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6fd44781c38a7d590153b54c04c0e86c69646fe1c4d6ac273908edb61e56013' 
  AND token = 'aqI+EJ07khlsHVEdoT8YLM8BZaMyu5dgH01hrt7qUKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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