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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8e5f9a255967b4bed2afe49cc22994ea342d9467358ad2169061b15911f55bd' 
  AND token = '6HIZG9YYuhDrqHOR19hnsd4l3se8s1HGqCTRHe7gN0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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