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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b2070d68acf6533aab0ea31fec9f61137e7ae7ffcca59aebdd94ae8570916f9' 
  AND token = 'TQP2yR8/Th1S1jUbYP5L4X5rZxEGYu93PiAZiesK9O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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