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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c69ff597e83c707af305dd1df81ec68a9104b07839aa8730097950c3ec0c5d0' 
  AND token = 'REhM9XqFYmknpNT87htYmoQ5t7MhXfYgi3vxO7GDgqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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