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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d4cfccd04719585ede176745a75a1b197f9049f0e47d962c8823bd01b11b660' 
  AND token = 'L4PbmqByGTp11EziEdo93WbHVNa2jnncrqfMCvicbRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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