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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56732b4b1c56a6c0637ea53a9f86ef9ca6621ef335a641b8b799d8ce11152bf6' 
  AND token = 'VvwXltsGwP8qMMZ8exFDfdmJN4qVuG3mqqMYSsTL8AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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