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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d0fa5ca7d399389e1f3e0f3d7679a1b954d45d3f80bfd0be51c5ffed13d69b9' 
  AND token = 'NzkwL3iqzYfmiK2+Gmgbg99G465v2UFhG9cfPtCtT94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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