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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dcfd6bb4192050c446fb7dc39c586bc83fa7ef38901df6e87c553aad7cb66a3' 
  AND token = 'ejk94yR+OQd/3t1XxN7RjmHUhWk6hEXjMCenideisF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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