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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbddd427fcf580d7c37b25a0ed66bbbd78158889c144ed3e3fd9174282bd8daa' 
  AND token = 'IsMxeK3x1QtC20jTf0whr2dGWOW7GMfydOEM/u4twJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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