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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c42ed93071d6726bde52a79f8c496722c3547b9457980568493a67435344724c' 
  AND token = 'w4IwcOMGF+CySv6SPLvnY8zmKk3vS3H8Ie3PDTjh/Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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