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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab21ce87b8413b3096c5ac6a747e2d0c34ed9f294267f01c45fda408eb963e4a' 
  AND token = 'XmFsnyINeaery4d9IG8EdBucGoFsmZHLr0mneie7IqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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