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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f8721e4fb1f84efa061c33781c5b933441ef29a89c877938e1095eaa4be4b5b' 
  AND token = '93ggobFOYL4qPi9FMWDuAlU+Ym+O4yEM3oG8KnDb6gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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