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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c076d8e10282732b28ba3b2086045c1ad8ad895b571920b532f12b81d4fa394a' 
  AND token = 'mwHkxjWMu2rPbgiuQfBw7sSERFjtSA6YQrWnJdxO3cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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