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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5326e51bdf2c463aa5faff7e7ad4710f22d1c6d476d4e6cbb3ecdfebda3304b' 
  AND token = '07QuJ7A+teyq6vrWlTq6i+cWxfJue6EzwGh0GNsRkRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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