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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba894d650d5278402914ad4351833bfc4c9343c1b35806d7aa6f7aa9910325f3' 
  AND token = 'F2Tla9bTqmXxX5d8V9dHW3WetsTV6k1YbpZa2dbFo+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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