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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66b9218e136bf1c322042c1b22a754bf480add5c979c1ec12496e4fc33690d3e' 
  AND token = 'dhq98aaWrUPDK0dhkvbW2XcDrkXMr5rmi2X0se4Pvfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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