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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b714649f195801916e3d918b2eedd4e81832734043455eede074070697f291f' 
  AND token = '27Iba9Z/d4je+eX3/8rD8QMCmcg5dwe3Y/sJQWRGFdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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