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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6919bdf23e5c77521b079736d669c06eeacc8042e2e8926701d4672901fe45d0' 
  AND token = 'oHkFvSUNDadaS+G4hQLTQ4oPU+ncqo+CoXzT6dbRiAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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