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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f513ed62b6d048001bd8eeba8973a34157761f24dc6e759a21e2c297c66342' 
  AND token = 'L0Gqxq0r2ReEuPA2QbZe4hwWc4BCQyg9jZJWyfBREXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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