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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac000e69663783d7e2546d1c5e49a99f6220d2610b35175075416ad9f56ca24' 
  AND token = 'gvEDDURWUUr1crQO2p1QLqt/QPrQ8+nIcNwUvmcUE/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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