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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4057f384fc2b378f5816e39a63bc303622e299be10aa3caac23cb645492eec5e' 
  AND token = 'hOS9nSOHeH7rJWe3Yxvwm3d4VvSacVttXR1OjbM/AoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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