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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db8d2e2e2356c1a8d5afbd6936f951cd7ebc0972ad58dd28544842d5f46f866' 
  AND token = 'mOriOcPmz8lgkiWL3rmyGE37cdgoX7rs+XRp/YlX68E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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