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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17c0b7b9b73da0b762dde8edfbb0a203a038241b2d6db508973670cf9fe01dc7' 
  AND token = '2YA8YF8adXfIuDv0/SI5x9ZDMHSYdzmg1a8By2/33ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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