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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c4d4cac5057851639a2951684cf0a7472720a96196f9c70be2f6fbe01e351b6' 
  AND token = 'p/7AOYQC6U85TDCfffVwrPLR77Cu8m5uj7wIN0eymSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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