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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd5edd7245ca2f9b1e0e27cda00e4c78f24cf84e25f9ff5a90f3071714b0a52e' 
  AND token = 'g+4oE6tDhsN1EzwyuTElVRVPWA4nibWrSZvDLHXhzv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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