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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc0776839605732dfc41c410a9b7aa0b6b6ed95b10465d648199a66fba6e89b' 
  AND token = 'XsYq1bYPhbiLI2mycerWjI7cz7T4RkNXHgEA2s5/mWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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