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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b8930c95b9b5a72714a04925e3b0073ff3c580a105e43daedc3e908c655ef01' 
  AND token = 'ZZg0qzkhviqDmmc1w3vDKuZh6XQiPjRck8K17gWiGtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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