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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3766195e5b6ee71c5b775cc81492d73af7b3ca84a52b7a9d6570d75abdc7b6d' 
  AND token = 'MtJduYJ1R4SVO+r5jylQCjNIgFn+3Bvkj9cfQlsoktM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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