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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998694a194c7e5b5439f124328c7a369b98a23e5834515c7498a46e0423e0ea5' 
  AND token = 'xPi3AOebks7g56+8RcizhunqN6+iEMYWF6UN7GKfne0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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