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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39df7afcf845b0e65577ff62cf676b826cb466dd90e4b7084e1828ab78947c33' 
  AND token = 'W3edhPktgAG8B77SW5uHR7NX7qKHoGB4I6761OTgV+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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