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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a973b3e62d591368d4c57004b45b6409d44eb976ad67ac31b3ccf4e3f05d3468' 
  AND token = '9jPincMRla8jqMcVWBhzSV5JCaZ2cVu4RORqqylX4JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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