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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d6ccb0e4b0b09f87ddbc09e7938f26036a70fa6a35a4c9e1fdbcd14d1efd70' 
  AND token = 'BZQT9OvwY+RzeUJN6xOKaM2WGoD/m7KEiAdPQKSfJO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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