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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da84c1a5f7f2c058dd080c182e91eaaa655215be0e0027a890d989ab738aed5' 
  AND token = 'Q4eC3a1ntokQ4woaJgdkmYqdLWvOb1mspeNWy+nJCJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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