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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8caa1e57f1efa2b2f2188c0d2fd9e7cefe2eb37f6c692e3cd832e5e93067ae9a' 
  AND token = 'TSKKWnye/8nN/oMbVsSu/tBqeMErRBaKkT2OQUjU594=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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