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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f431a17de43c99c8143f9e33e9e24287b0b82c5d705c18d0ba040f7ae00038ce' 
  AND token = '/0WbicJjaFjyIjssTP2YEATznmd7J2VTPnB1KQKeWqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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