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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d1f48d033ed65172c4095563e1cec1e5d2208ccba0db46c9ce701d7ccce2928' 
  AND token = 'JJ0sGW93IZcV1R77hs3uOl51B5KYHMmsh/ATECkza3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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