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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36aae1d523b0cb0bcd69e1a6f77b7f26c505187644d2d1a137e48d1bfe893c37' 
  AND token = 'lbNsE8QOZk3Aw8UQ7oOhh7HZ133E5a/eLxITdYibJkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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